All reports of sharedobject-in-library-directory-missing-soname for the archive. The extended description of this tag is:
A shared object was identified in a library directory (a directory in the standard linker path) which doesn't have a SONAME. This is usually an error.
SONAMEs are set with something like gcc -Wl,-soname,libfoo.so.0, where 0 is the major version of the library. If your package uses libtool, then libtool invoked with the right options should be doing this.
To view the SONAME of a shared library, run readelf -d on the shared library and look for the tag of type SONAME.
This tag has not been emitted in any package tested by Lintian.